Definition
to make a great effort to think of or remember something.
费尽心思
I've been racking my brains trying to figure out how to solve this problem.
我一直在绞尽脑汁试图找出解决这个问题的方法。
She racked her brain, but still couldn't remember where she put the keys.
她绞尽脑汁，但仍然想不起来她把钥匙放在哪里。
The students racked their brains trying to answer the difficult questions the teacher posed.
学生们绞尽脑汁试图回答老师提出的难题。